linker errors with class

[Michael P.]

Mike Parker Wrote:

> Michael P. wrote:
> > BCS Wrote:
> > 
> >> Reply to Michael P.,
> >>
> >>> I'm getting an undefined reference error with Derelict and SDL.
> >>> I tried to create an SDLImage class, but I got an error when the files
> >>> try to link together.
> >>> I've attached the two .d files in a rar.
> >>> I compiled with "build imagetest".
> >>> I have Bud 3.04, and DMD version 1.036.
> >>> I have compiled other SDL programs, so everything is set up properly
> >>> with Derelict.
> >>> -Michael P.
> >>>
> >> what are the error messages? (copy/pates)
> >>
> >>
> > 
> > C:\Documents and Settings\Default\My Documents\DProjects\Derelict\ build imagetest
> > OPTLINK (R) for Win32  Release 8.00.1
> > Copyright (C) Digital Mars 1989-2004  All rights reserved.
> > SDLImages.obj(SDLImages)
> > Error 42: Symbol Undefined _D9SDLImages11SDL_Imagess5_dtorMFZv
> 
> The linker is expecting to find a destructor for your SDLImagess class 
> in the object file, but it's not there. Your problem is on line 44 of 
> SDLImages.d:
> 
> //Destructor
> ~this();
> 
> Your destructor is declared, but not implemented -- hence the error. If 
> you've got nothing to do in the destructor, either implement an empty one:
> 
> ~this() {}
> 
> Or take it out entirely, in which case the compiler will generate a 
> default destructor for you.
> 
> IMO, this should really be a compiler error. I'm surprised it isn't.


Thanks, that worked. :D